Telegraph-transmitter.



R. S. WELTY.

TELEGRAPH TRANSMITTER.

APPLICATION FILED JULY 19,1911.

1,031,752. Patented July 9, 1912.

2 SHEETS-SHEET 1.

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R. S. WELTY.

TELEGRAPH TRANSMITTER.

APPLICATION FILED JULY 19,1911.

1,031,752. Patented July 9, 1912.

2 SHEETS-SHEET 2.

awe/whom (am/WW9 B11336 Zlfi. ez/Z RUSSELL S. WELTY, OF SUDBROOK PARK, MARYLAND.

TELEGRAPH-TRANSMITTER.

Specification of Letters Patent.

Patented July 9, 1912.

Application filed July 19, 1911. Serial No. 639,305.

To all "whom 2'2? may concern Be it known that I, RUSSELL S. WELTY, a citizen of the United States, residing at Sudbrook Park, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvements in Telegraph-Transmitters, of which the following is a specification, reference being had to the accompanying drawings.

This invention is an improved telegraph transmitter, and consists in the construction, combination and arrangement of de vices hereinafter described and claimed.

The object of my invention is to eifect improvements in the construction of a telegraph transmitter by means of which the device is adapted to be adjusted from high to low and from low to high speed without the necessity of making a number of adjustments and by merely moving an adjusting weight forwardly and rearwardly as may be required.

In the accompanying drawings Figure 1 is a plan of a telegraph transmitter con structed in accordance with my invention; Fig. 2 is partly an elevation and partly a longitudinal sectional view of the same on the plane indicated by the line a-a of- Fig. 1; Fig. 3 is a transverse sectional view on the plane indicated by the line bb of Fig. 1; a is a similar view on the plane indicated by the line cc of Fig. 1; Fig. 5 is a detail sectional view taken on the plane indicated by the line 6Z6Z of Fig. 1.

The base of my improved telegraph transmitter is indicated at 1. A post 2 rises from the base and is provided with an adjusting screw 3 which passes through and engages a transverse threaded opening in the 'post. The post is insulated from the base as at 4: and is provided at a suitable point with an insulating block 5. A horizontally disposed longitudinally extending spring 6 has one end secured on one side ofthe block, the outer end of the spring being curved as at 7. A spring 8 which 1 term a dot spring is secured on the base 1 and between it and the lower end of the post 2, extends transversely.

on the base and terminates'inan upturned inverted U-shaped arm 9, the terminal mem ber 10 of which is provided with a platinum 9 contact point 11. The adjusting screw 0- prises a vertical member 13 and a horizontal lower member 14 has the latter secured on the base 1. A similarly shaped clamping member 15 which comprises a horizontal upper arm 16 and a vertical arm 17 has the said vertical arm secured to the vertical arm 13 of-the standard by means of a clamping bolt 18 and between the vertical arm of the standard and the vertical arm of the clamp is secured one end of a main swing spring 19 which extends longitudinally from .the standard, passes the terminal 10 of the dot spring 8 and is provided with a platinum contact point 20 to make and break electric contact with the point 11. The spring 19 is a comparatively light spring and the dot spring 8 is a comparatively heavy spring. A swinging and adjusting weight2l is provided in its under side with a vertical longitudinal kerf through which the main swing spring 19 extends and in one side of the said kerf is a securing spring 22 which is bowed as indicated in Fig. 1 and has one end outturned and secured at the outer end of the weight 21 as at 23. This spring 22 bears against the main swing spring so as to keep the latter in frictional engagement with the said spring 22 and also with one side of the kerf, and, hence,-secures the weight 21 on the spring 19 while adapting the weight to be readily adjusted longitudinally of the spring, the spring 22 serving to secure the weight at any desired adjustment on the swing spring 19. In order to prevent the swing spring 19- from unduly flexing or bending laterally I provide a weight 2 1 which has a kerf in its under side through which the spring 19 extends, the said weight being disposed at a suitable distance from the standard 13 and being held in adjusted position on the spring 19 by a spring 25 which is similar in construction to the spring 22 hereinbefore described.

A plunging bar 26 is provided at one end with a thumb lever 27, which is made of insulating material. A vertical arbor 28 passes through the thumb lever and has its upper and lower ends mounted in bearings, as at 29, in the horizontal members of the standard 12 and the clamp 15. A stop 30 projects downwardly from the thumb lever and operates between a pair of adjusting screws 31 which are carried by the vertical ends of a V-shaped yoke 32 which is secured on the base by a bolt 33. A spring 3 1, which is here shown as coiled around the 19 to the right, a suflicient distance to open the dot contact 11 from the dot contact 20. The bufier is preferably made ofsoft rubber and is held in a shoulder in a head 37 of insulating material, which is secured on the end of the plunging bar.

A plate 38 is riveted or otherwise suitably secured on the upper side of the thumb lever and projects from the right hand side thereof. A dash lever 39, which is also made of insulating material, is provided on a pin 40 which projects downwardly from the plate 38. A bolt 41 passes through and connects the thumb and dash levers and has an adjusting nut 42 which bears against the outer side of the thumb lever. The thumb and dash levers are respectively provided on their opposing sides with platinum contact points 43, 44, and a spring 45 is placed on the adjusting bolt, bears between the thumb and dash levers and keeps their contact points normally open.

A lead wire 46, which extends through a bore in the insulated thumb lever, connects the contact point 43 thereof to the arbor 28. A wire 47, which extends through a bore in the dash lever, connects to the contact point 44, passes out from the dash lever, is insulated, passed down through the base 1, and attached to a binding post 48, which is also insulated, the said wire 47 also connecting the binding post 48 and the post 2, hence completing the circuit when the thumb and dash contacts 43 and 44 close together. non-insulated binding post 49, secured on the base 1, is provided with a plate 50, to which is provided a circuit closing lever 51.

The operator bears his thumb against the outer side of the thumb lever and his forefinger, or some other finger if he prefers, against the outer side of the dash lever, and operates said levers to make the required dots and dashes in sending messages. Then the buffer of the plunger bar strikes the weight 21, it moves said weight and the,

spring 19 to the right a sufiicient distance to open the dot contact point 20 from the dot contact point 11. The spring 6, which is on the right hand side of the said weight, prevents excessive vibration of the springv 19 and excessive movement of the said weight. The .rebound of the spring and weight causes the dot contact point 20 to strike heavily against the dot contact point 11,'

thus making perfect electrical contact between these points, preventing what is termed the splitting of dots, and causing the dots to carry even though the current may be very light. The spring 8, which carries the dot contact 11, and which is much heavier than the main swing spring 19 enables the contact point 11 to yield somewhat under the blows of the contact point 20, without separating therefrom, or, in other words, such spring 8 cushions both of said contact points when they are in contact. The amplitude of vibrationv of the main swing spring 19 and corresponding oscillatory movement of the hammering weight 21 may be varied as may be required by simply adjusting the said weight longitudinally of the said spring, the spring 23 and connection, hereinbefore described, between the said weight and the spring 19 permitting such adjustment. After the spring 8 has been once properly adjusted by the screw 3,

such adjustment of said spring need not Q thereafter be changed. The dashes are made by closing the thumb and dash levers, so as to bring their contact points 43 and 44 in contact. It will be observed that the dashes are made close to the ends of the thumb and I dash levers where they are grasped, such location of the dash contact points greatly facilitating the operation of the thumb and dash levers and enabling the operator to make perfect contact, make the clashes uniformly, and to make dash letters perfectly, and not choking them when made with the speed of the dots.

The thumb and dash levers being made entirely of insulating material and their contact points being on their opposing sides, there is no liability of the operator receiving a shock when using the transmitter,as in my improved transmitter there are no prominent charged points, as in the vibroplex and mecograph transmitters close to the operato-rs fingers. In fact it is practically impossible to receive a shock from my improved transmitter excepting by coming in contact with the posts 2 and 48 at the same time with some other part of the transmitter, which is very unlikely to casually occur.

The wire 47 connects to the contact point 44, passes through a bore in the dash lever 39, passes out of the dash lever, is insulated down through the base 1, attached to insulated binding post 48 and extended to post 2, concluding the circuit either when the dashes are made by pressing the dash lever ,7

passes through the base 1 and is also insulated. The wire 46 passes through'a bore in the thumb lever 27 and is connected to a vertical arbor 28 which is in constant contact with the base 1. The non-insulated binding post 49 accommodates one side of the circuit which is in direct contact with the arbor 28 and lead-in wire 46, thus completing the circuit to the contact point 43 of the thumb lever. The insulated binding post 49 accommodates the current and passes into the leadin wire 47 as above described, insulated through the base 1, and extending to dash lever 39 through the bore in the dash lever, is attached to the contact point 44, thus completing the dash circuit when the dash lever contact comes in contact with the thumb lever. The main swing spring 19 is in constant contact with the binding post 49, being connected to the standard 12 and clamp 15 which is attached to base 1, thus completing the circuit to the contact point 20, hence the non-insulated current arrives at the contact point 20 and the insulated current arrives at 11, making contact between the points 11 and 20 when the main swing spring 19 is in vibration.

Having thus described my invention I claim:

1. A telegraph transmitter of the class described having a main swingspring bar, and a hammer weight having a longitudinal kerf through which the spring bar extends, the said hammer weight being also provided with a securing spring in one side of said kerf bearing against said spring bar and securing the hammer weight adjustably on said spring bar.

2. In a telegraph transmitter of the class described, a main swing spring bar having a dot contact point, a hammer weight on said spring bar, a support having a dot contact point for engagement by that of the spring bar on the rebound of the latter and the hammer weight, a thumb lever having a plunging bar to strike the hammer weight, said thumb lever having a dash contact point, a dash lever movable toward and from the thumb lever and having a dash contact point for engagement with that of the thumb lever, a spring to move the thumb lever in one direction and cause its plunging bar to normally engage the hammer weight and open the dash contact points, and a spring to normally open the dash lever from the thumb lever.

3. In a telegraph transmitter of the class described, a main swing spring bar having a dot contact point, a hammer weight on said spring bar, a support having a dot contact point for engagement by that of the spring bar on the rebound of the latter and the hammer Weight, a thumb lever having a plunging bar to strike the hammer weight, said thumb lever having a dash contact point, a dash lever movable toward and from the thumb lever and having a dash contact point for engagement with that of the thumb lever, a spring to move the thumb' lever in one direction and cause its plunging bar to normally engage the hammer weight and open the dash contact points, a spring to normally open the dash lever from the thumb lever, and adjusting means to limit the movement of the thumb lever.

4. In a telegraph transmitter of the class described, a support having a dot contact point, a main swing spring bar having a dot contact point, a hammer weight on the main swing spring bar, a thumb lever having a plunging bar to strike the hammer weight and normally open the dotcontact points, said thumb lever having on its inner side a dash contact point, a spring to move the thumb lever in one direction and cause the plunging bar to engage the hammer weight for the purpose set forth, a dash lever pivotally connected to and carried by the thumb lever and having a dash contact point opposite that of the thumb lever, a spring to open the dash lever from the thumb lever, means to vary the extent of angular movement be tween the said thumb levers, and adjustable means to vary the extent of movement of the thumb lever.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses. RUSSELL S. WELTY. Witnesses:

EVA S. WELTY, FLORA R. WELTY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

